Cushman: New England species of Closterium 119 





Length 108-170/*; breadth 10-15 /i ; apices 1.5-2.3/*. 

 (Plate 3, figures 6, 7.) 



Maine : Orono {Harvey) ; Mud Pond, Township 6, Range 12 ! 



New Hampshire : Pudding Pond, North Conway ! 



Massachusetts: Amherst (W. West); Lake Quinsigamond, 

 Worcester (Stone) ; South Framingham ! Medford ! 



In the absence of zygospores, the C. calosporum reported from 

 North Conway, N. H. is included here. 



17. Closterium Jenneri Ralfs 



Closterium Jenneri Ralfs, Brit. Desm. 167. //. 28. f. 6. 1848. 



Wolle, Desm. U. S. 44. //. 7. / 5. 1884. — W. & G. S. 

 West, Brit. Desm. 1 : 134. pi. 15. f. 23-25. 1904. 



Cells small, strongly curved, especially toward the ends, the 

 middle portion nearly straight, apices obtusely rounded ; cell-wall 

 colorless, smooth. 



Length 40-75 p ; breadth 6-10//. (Plate 5, figures 3, 4.) 



Maine: Mud Pond, Township 6, Range 12 ! 

 Massachusetts: Amherst (W. West); Lake Qu 



Worcester (Stone) ; Misery Island, off Beverly, rare ! 

 tuppa, Fall River ! 



Rhode Island : Wainskut Pond, North Providen 

 Portsmouth ! Nyatt ! 



Wa 









18. Closterium incurvum Breb. 

 Closterium incurvum Breb. Mem. Soc. Sci. Nat. Cherbourg 4: 



150. pi. 2. f. 47. 1856. 

 136. //. 75. /. 28-30. 1904. 



West 



Cells very small, strongly curved, 5-6 times as long as wide, 

 apices acute ; cell-wall colorless, smooth. 



Length 62-68 ft ; breadth 1 1-12 //. (Plate 3, figure 8.) 



New Hampshire : Intervale ! 



Massachusetts : Reading ! Gibbs and Almanac Ponds, Nan- 



tucket ! 



19. Closterium Venus Kutz. 



Closterium Venus Kutz. Phyc. Germ. 130. i8 4 5- — Wolle, Desm. 



U. S. 44. P L 7. /. 6. 1 884. - W. & G. S. West, Brit. Desm. 



1: *37. //. rj. f. 15-20. 1904. 



Cells small, strongly curved, 8-9 times as long as wide, apices 

 acute ; cell-wall colorless and smooth. 



